Designing high-quality professional development for mathematics educators requires close attention to many facets of teacher learning. Learning From NAEP is a valuable manual-plus-CD resource containing activities and workshops that facilitators can use as is or tailor to the unique needs of participants in their school's or district's professional development programme. The materials, which draw on the experiences of educators and the expertise of researchers, help educators better understand the intricacies of national assessment data and how such data relate to student learning in mathematics classrooms. The CD-ROM provides the materials and tools necessary to facilitate the workshops, as well as resources to help expand or create a workshop.